RESTier is a RESTful API development framework for building standardized, OData V4 based RESTful services on .NET platform. It can be seen as a middle-ware on top of Web API OData. RESTier provides facilities to bootstrap an OData service like what WCF Data Services (which is sunset) does, beside this, it supports to add business logic in several simple steps, has flexibility and easy customization like what Web API OData do.

RESTier - A turn-key library for building RESTful services

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 
 
Repose can be run as a standalone application (either as a Linux service or using the JAR directly), or it can be deployed as a WAR file in a servlet container alongside your origin service. Repose can be run on the same server or on a different server, and it can be run across multiple servers for horizontal scaling. At its core, Repose is a proxy that allows services to use Enterprise Integration Patterns (EIP).

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 

Repose - The REstful PrOxy Service Engine

The apiman project brings an open source development methodology to API Management, coupling a rich API design & configuration layer with a blazingly fast runtime. It helps to govern your API. It is flexible, policy-based runtime governance for your APIs. Offer the same API through multiple plans, allowing different levels of service to different API consumers.
 
It provides rich management layer (REST API and separate UI) to manage/configure not only APIs but also the client applications that consume them. The runtime engine's API is fully asynchronous and is designed to run equally well in both a standard Java EE environment and newer async runtimes like Vert.x.

The apiman project brings an open source development methodology to API Management, coupling a rich API design & configuration layer with a blazingly fast runtime. It helps to govern your API. It is flexible, policy-based runtime governance for your APIs. Offer the same API through multiple plans, allowing different levels of service to different API consumers.

APIMAN - Open Source API Management

Thumbnailator is a thumbnail generation library for Java. Learning how to use the Image I/O API, Java 2D API, image processing, image scaling techniques etc is fairly difficult task. Thumbnailator will take care of all those things for you. Thumbnailator is a single JAR file with no dependencies to external libraries, making development and deployment simple and easy. It also provides support to watermark, rotate, fluent API.

Thumbnailator - A thumbnail generation library for Java

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.
 
It can automatically mock network/external dependencies with correct responses. No more manually writing mocks for dependencies like DBs, internal services, or third party services like twilio, shopify or stripe. It can safely replay writes or mutations by capturing from local or other environments. 
 
It also does automatic instrumentation for popular libraries/drivers like sql, http, grpc, etc. Web Console is available to visually understand the results, update behaviour and share findings across your team.

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.

Keploy - No code API testing platform. Create unit tests and data mocks from API calls

Newton does anything from numerical calculation to symbolic math parsing. Send a GET request to newton with a url-encoded math expression and your preferred operation. Get back a JSON response with your problem solved.

newton-api - A really micro micro-service for advanced math

Smocker (server mock) is a simple and efficient HTTP mock server. Smocker exposes two ports: Port 8080 is the mock server port. It will expose the routes you register through the configuration port and Port 8081 is the configuration port. It's the port you will use to register new mocks. This port also exposes a user interface.

Smocker - Simple and efficient HTTP mock server

Apicurio Registry is an API/Schema registry - stores and retrieves APIs and Schemas. 

Apicurio Registry - An API/Schema registry - stores and retrieves APIs and Schemas

A FREE RESTful HTTP based JSON API. It lets you create, read, update, delete and search JSON data over HTTP APIs. Ideal for small hobbies projects, MVP or just for fun, where you don't need to create your personal data storage.

DatoJi - A tiny JSON storage service. Create, Read, Update, Delete and Search JSON data

Daptin is a headless CMS framework to develop and deploy production-ready JSON API based servers. Its feature include Database backed persistence, Rest JSON APIs, OAuth Authentication, Host static sites on multiple sub-domains, Use any cloud storage providers as persistence for files and assets.

Daptin - GraphQL/JSON-API Headless CMS

Powerful declarative end-to-end testing for APIs that works for you! No coding required. Simple to run on any continuous integration tool. Model complex real world customer flows with multiple steps with our extensive declarative syntax.

apid - Declarative API end to end testing framework

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